Odpowiedź:
b)
4x + 4 + 2x +1 +5x +3 = 30
11x + 8 = 30
11x = 30 - 8
11x = 22
x = 2
2 * 2 + 1 = 5
4 * 2 + 4 * 1 = 12
P = (12 * 5)/2 = 30
c)
2x + 1 + x + 1 + 3x + 1 + 4x - 1 = 42
10x + 2 = 42
10x = 40
x = 4
P = (14 * 12)/2 = 84
